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📁 ..
📄 ABIInfo.h(5.01 KB)
📄 Address.h(3.28 KB)
📄 BackendUtil.cpp(67.92 KB)
📄 CGAtomic.cpp(85.95 KB)
📄 CGBlocks.cpp(111.14 KB)
📄 CGBlocks.h(8.94 KB)
📄 CGBuilder.h(13.78 KB)
📄 CGBuiltin.cpp(695.8 KB)
📄 CGCUDANV.cpp(35.16 KB)
📄 CGCUDARuntime.cpp(1.53 KB)
📄 CGCUDARuntime.h(3.4 KB)
📄 CGCXX.cpp(11.8 KB)
📄 CGCXXABI.cpp(12.47 KB)
📄 CGCXXABI.h(27.9 KB)
📄 CGCall.cpp(197.3 KB)
📄 CGCall.h(11.62 KB)
📄 CGClass.cpp(113.54 KB)
📄 CGCleanup.cpp(46.97 KB)
📄 CGCleanup.h(19.28 KB)
📄 CGCoroutine.cpp(27.82 KB)
📄 CGDebugInfo.cpp(191.42 KB)
📄 CGDebugInfo.h(34.73 KB)
📄 CGDecl.cpp(97.98 KB)
📄 CGDeclCXX.cpp(34.73 KB)
📄 CGException.cpp(80.38 KB)
📄 CGExpr.cpp(209.78 KB)
📄 CGExprAgg.cpp(77.04 KB)
📄 CGExprCXX.cpp(90.39 KB)
📄 CGExprComplex.cpp(44.9 KB)
📄 CGExprConstant.cpp(86.17 KB)
📄 CGExprScalar.cpp(196.29 KB)
📄 CGGPUBuiltin.cpp(6.17 KB)
📄 CGLoopInfo.cpp(29.17 KB)
📄 CGLoopInfo.h(10.5 KB)
📄 CGNonTrivialStruct.cpp(41.4 KB)
📄 CGObjC.cpp(142.79 KB)
📄 CGObjCGNU.cpp(168.38 KB)
📄 CGObjCMac.cpp(304.84 KB)
📄 CGObjCRuntime.cpp(14.68 KB)
📄 CGObjCRuntime.h(14.81 KB)
📄 CGOpenCLRuntime.cpp(7.08 KB)
📄 CGOpenCLRuntime.h(3.44 KB)
📄 CGOpenMPRuntime.cpp(501.86 KB)
📄 CGOpenMPRuntime.h(111.87 KB)
📄 CGOpenMPRuntimeNVPTX.cpp(215.42 KB)
📄 CGOpenMPRuntimeNVPTX.h(22.59 KB)
📄 CGRecordLayout.h(7.84 KB)
📄 CGRecordLayoutBuilder.cpp(38.24 KB)
📄 CGStmt.cpp(92.92 KB)
📄 CGStmtOpenMP.cpp(278.04 KB)
📄 CGVTT.cpp(6.81 KB)
📄 CGVTables.cpp(55.02 KB)
📄 CGVTables.h(6.38 KB)
📄 CGValue.h(21.24 KB)
📄 CodeGenABITypes.cpp(5 KB)
📄 CodeGenAction.cpp(46.2 KB)
📄 CodeGenFunction.cpp(95.34 KB)
📄 CodeGenFunction.h(200.94 KB)
📄 CodeGenModule.cpp(228.13 KB)
📄 CodeGenModule.h(60.91 KB)
📄 CodeGenPGO.cpp(36.17 KB)
📄 CodeGenPGO.h(4.36 KB)
📄 CodeGenTBAA.cpp(16.92 KB)
📄 CodeGenTBAA.h(9.19 KB)
📄 CodeGenTypeCache.h(3.28 KB)
📄 CodeGenTypes.cpp(32.35 KB)
📄 CodeGenTypes.h(13.42 KB)
📄 ConstantEmitter.h(6.65 KB)
📄 ConstantInitBuilder.cpp(10.29 KB)
📄 CoverageMappingGen.cpp(54.64 KB)
📄 CoverageMappingGen.h(4.04 KB)
📄 EHScopeStack.h(14.38 KB)
📄 ItaniumCXXABI.cpp(176.66 KB)
📄 MacroPPCallbacks.cpp(6.41 KB)
📄 MacroPPCallbacks.h(4.54 KB)
📄 MicrosoftCXXABI.cpp(175.41 KB)
📄 ModuleBuilder.cpp(11.79 KB)
📄 ObjectFilePCHContainerOperations.cpp(12.93 KB)
📄 PatternInit.cpp(4.1 KB)
📄 PatternInit.h(722 B)
📄 SanitizerMetadata.cpp(4.21 KB)
📄 SanitizerMetadata.h(1.63 KB)
📄 SwiftCallingConv.cpp(29.76 KB)
📄 TargetInfo.cpp(403.11 KB)
📄 TargetInfo.h(15.43 KB)
📄 VarBypassDetector.cpp(5.1 KB)
📄 VarBypassDetector.h(2.29 KB)

Editing: PatternInit.cpp

//===--- PatternInit.cpp - Pattern Initialization -------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "PatternInit.h"
#include "CodeGenModule.h"
#include "clang/Basic/TargetInfo.h"
#include "llvm/IR/Constant.h"
#include "llvm/IR/Type.h"

llvm::Constant *clang::CodeGen::initializationPatternFor(CodeGenModule &CGM,
                                                         llvm::Type *Ty) {
  // The following value is a guaranteed unmappable pointer value and has a
  // repeated byte-pattern which makes it easier to synthesize. We use it for
  // pointers as well as integers so that aggregates are likely to be
  // initialized with this repeated value.
  // For 32-bit platforms it's a bit trickier because, across systems, only the
  // zero page can reasonably be expected to be unmapped. We use max 0xFFFFFFFF
  // assuming that memory access will overlap into zero page.
  const uint64_t IntValue =
      CGM.getContext().getTargetInfo().getMaxPointerWidth() < 64
          ? 0xFFFFFFFFFFFFFFFFull
          : 0xAAAAAAAAAAAAAAAAull;
  // Floating-point values are initialized as NaNs because they propagate. Using
  // a repeated byte pattern means that it will be easier to initialize
  // all-floating-point aggregates and arrays with memset. Further, aggregates
  // which mix integral and a few floats might also initialize with memset
  // followed by a handful of stores for the floats. Using fairly unique NaNs
  // also means they'll be easier to distinguish in a crash.
  constexpr bool NegativeNaN = true;
  constexpr uint64_t NaNPayload = 0xFFFFFFFFFFFFFFFFull;
  if (Ty->isIntOrIntVectorTy()) {
    unsigned BitWidth =
        cast<llvm::IntegerType>(Ty->getScalarType())->getBitWidth();
    if (BitWidth <= 64)
      return llvm::ConstantInt::get(Ty, IntValue);
    return llvm::ConstantInt::get(
        Ty, llvm::APInt::getSplat(BitWidth, llvm::APInt(64, IntValue)));
  }
  if (Ty->isPtrOrPtrVectorTy()) {
    auto *PtrTy = cast<llvm::PointerType>(Ty->getScalarType());
    unsigned PtrWidth = CGM.getContext().getTargetInfo().getPointerWidth(
        PtrTy->getAddressSpace());
    if (PtrWidth > 64)
      llvm_unreachable("pattern initialization of unsupported pointer width");
    llvm::Type *IntTy = llvm::IntegerType::get(CGM.getLLVMContext(), PtrWidth);
    auto *Int = llvm::ConstantInt::get(IntTy, IntValue);
    return llvm::ConstantExpr::getIntToPtr(Int, PtrTy);
  }
  if (Ty->isFPOrFPVectorTy()) {
    unsigned BitWidth = llvm::APFloat::semanticsSizeInBits(
        Ty->getScalarType()->getFltSemantics());
    llvm::APInt Payload(64, NaNPayload);
    if (BitWidth >= 64)
      Payload = llvm::APInt::getSplat(BitWidth, Payload);
    return llvm::ConstantFP::getQNaN(Ty, NegativeNaN, &Payload);
  }
  if (Ty->isArrayTy()) {
    // Note: this doesn't touch tail padding (at the end of an object, before
    // the next array object). It is instead handled by replaceUndef.
    auto *ArrTy = cast<llvm::ArrayType>(Ty);
    llvm::SmallVector<llvm::Constant *, 8> Element(
        ArrTy->getNumElements(),
        initializationPatternFor(CGM, ArrTy->getElementType()));
    return llvm::ConstantArray::get(ArrTy, Element);
  }

// Note: this doesn't touch struct padding. It will initialize as much union
  // padding as is required for the largest type in the union. Padding is
  // instead handled by replaceUndef. Stores to structs with volatile members
  // don't have a volatile qualifier when initialized according to C++. This is
  // fine because stack-based volatiles don't really have volatile semantics
  // anyways, and the initialization shouldn't be observable.
  auto *StructTy = cast<llvm::StructType>(Ty);
  llvm::SmallVector<llvm::Constant *, 8> Struct(StructTy->getNumElements());
  for (unsigned El = 0; El != Struct.size(); ++El)
    Struct[El] = initializationPatternFor(CGM, StructTy->getElementType(El));
  return llvm::ConstantStruct::get(StructTy, Struct);
}

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Editing: PatternInit.cpp

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